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apache / xalan-site / baed2198e564a4221346ce9823f7f57830a0d758 / . / docs / xalan / xalan-j / apidocs / src-html / org / apache / xalan / xsltc / compiler / BinOpExpr.html
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<FONT color="green">001</FONT> /*<a name="line.1"></a>
<FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT> * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT> * to you under the Apache License, Version 2.0 (the "License");<a name="line.6"></a>
<FONT color="green">007</FONT> * you may not use this file except in compliance with the License.<a name="line.7"></a>
<FONT color="green">008</FONT> * You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT> *<a name="line.9"></a>
<FONT color="green">010</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT> *<a name="line.11"></a>
<FONT color="green">012</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT> * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT> * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT> */<a name="line.17"></a>
<FONT color="green">018</FONT> /*<a name="line.18"></a>
<FONT color="green">019</FONT> * $Id: BinOpExpr.java 468650 2006-10-28 07:03:30Z minchau $<a name="line.19"></a>
<FONT color="green">020</FONT> */<a name="line.20"></a>
<FONT color="green">021</FONT> <a name="line.21"></a>
<FONT color="green">022</FONT> package org.apache.xalan.xsltc.compiler;<a name="line.22"></a>
<FONT color="green">023</FONT> <a name="line.23"></a>
<FONT color="green">024</FONT> import org.apache.bcel.generic.InstructionList;<a name="line.24"></a>
<FONT color="green">025</FONT> import org.apache.xalan.xsltc.compiler.util.ClassGenerator;<a name="line.25"></a>
<FONT color="green">026</FONT> import org.apache.xalan.xsltc.compiler.util.ErrorMsg;<a name="line.26"></a>
<FONT color="green">027</FONT> import org.apache.xalan.xsltc.compiler.util.MethodGenerator;<a name="line.27"></a>
<FONT color="green">028</FONT> import org.apache.xalan.xsltc.compiler.util.MethodType;<a name="line.28"></a>
<FONT color="green">029</FONT> import org.apache.xalan.xsltc.compiler.util.Type;<a name="line.29"></a>
<FONT color="green">030</FONT> import org.apache.xalan.xsltc.compiler.util.TypeCheckError;<a name="line.30"></a>
<FONT color="green">031</FONT> <a name="line.31"></a>
<FONT color="green">032</FONT> /**<a name="line.32"></a>
<FONT color="green">033</FONT> * @author Jacek Ambroziak<a name="line.33"></a>
<FONT color="green">034</FONT> * @author Santiago Pericas-Geertsen<a name="line.34"></a>
<FONT color="green">035</FONT> */<a name="line.35"></a>
<FONT color="green">036</FONT> final class BinOpExpr extends Expression {<a name="line.36"></a>
<FONT color="green">037</FONT> public static final int PLUS = 0;<a name="line.37"></a>
<FONT color="green">038</FONT> public static final int MINUS = 1;<a name="line.38"></a>
<FONT color="green">039</FONT> public static final int TIMES = 2;<a name="line.39"></a>
<FONT color="green">040</FONT> public static final int DIV = 3;<a name="line.40"></a>
<FONT color="green">041</FONT> public static final int MOD = 4;<a name="line.41"></a>
<FONT color="green">042</FONT> <a name="line.42"></a>
<FONT color="green">043</FONT> private static final String[] Ops = {<a name="line.43"></a>
<FONT color="green">044</FONT> "+", "-", "*", "/", "%"<a name="line.44"></a>
<FONT color="green">045</FONT> };<a name="line.45"></a>
<FONT color="green">046</FONT> <a name="line.46"></a>
<FONT color="green">047</FONT> private int _op;<a name="line.47"></a>
<FONT color="green">048</FONT> private Expression _left, _right;<a name="line.48"></a>
<FONT color="green">049</FONT> <a name="line.49"></a>
<FONT color="green">050</FONT> public BinOpExpr(int op, Expression left, Expression right) {<a name="line.50"></a>
<FONT color="green">051</FONT> _op = op;<a name="line.51"></a>
<FONT color="green">052</FONT> (_left = left).setParent(this);<a name="line.52"></a>
<FONT color="green">053</FONT> (_right = right).setParent(this);<a name="line.53"></a>
<FONT color="green">054</FONT> }<a name="line.54"></a>
<FONT color="green">055</FONT> <a name="line.55"></a>
<FONT color="green">056</FONT> /**<a name="line.56"></a>
<FONT color="green">057</FONT> * Returns true if this expressions contains a call to position(). This is<a name="line.57"></a>
<FONT color="green">058</FONT> * needed for context changes in node steps containing multiple predicates.<a name="line.58"></a>
<FONT color="green">059</FONT> */<a name="line.59"></a>
<FONT color="green">060</FONT> public boolean hasPositionCall() {<a name="line.60"></a>
<FONT color="green">061</FONT> if (_left.hasPositionCall()) return true;<a name="line.61"></a>
<FONT color="green">062</FONT> if (_right.hasPositionCall()) return true;<a name="line.62"></a>
<FONT color="green">063</FONT> return false;<a name="line.63"></a>
<FONT color="green">064</FONT> }<a name="line.64"></a>
<FONT color="green">065</FONT> <a name="line.65"></a>
<FONT color="green">066</FONT> /**<a name="line.66"></a>
<FONT color="green">067</FONT> * Returns true if this expressions contains a call to last()<a name="line.67"></a>
<FONT color="green">068</FONT> */<a name="line.68"></a>
<FONT color="green">069</FONT> public boolean hasLastCall() {<a name="line.69"></a>
<FONT color="green">070</FONT> return (_left.hasLastCall() || _right.hasLastCall());<a name="line.70"></a>
<FONT color="green">071</FONT> }<a name="line.71"></a>
<FONT color="green">072</FONT> <a name="line.72"></a>
<FONT color="green">073</FONT> public void setParser(Parser parser) {<a name="line.73"></a>
<FONT color="green">074</FONT> super.setParser(parser);<a name="line.74"></a>
<FONT color="green">075</FONT> _left.setParser(parser);<a name="line.75"></a>
<FONT color="green">076</FONT> _right.setParser(parser);<a name="line.76"></a>
<FONT color="green">077</FONT> }<a name="line.77"></a>
<FONT color="green">078</FONT> <a name="line.78"></a>
<FONT color="green">079</FONT> public Type typeCheck(SymbolTable stable) throws TypeCheckError {<a name="line.79"></a>
<FONT color="green">080</FONT> final Type tleft = _left.typeCheck(stable); <a name="line.80"></a>
<FONT color="green">081</FONT> final Type tright = _right.typeCheck(stable);<a name="line.81"></a>
<FONT color="green">082</FONT> final MethodType ptype = lookupPrimop(stable, Ops[_op],<a name="line.82"></a>
<FONT color="green">083</FONT> new MethodType(Type.Void,<a name="line.83"></a>
<FONT color="green">084</FONT> tleft, tright)); <a name="line.84"></a>
<FONT color="green">085</FONT> if (ptype != null) {<a name="line.85"></a>
<FONT color="green">086</FONT> final Type arg1 = (Type) ptype.argsType().elementAt(0);<a name="line.86"></a>
<FONT color="green">087</FONT> if (!arg1.identicalTo(tleft)) {<a name="line.87"></a>
<FONT color="green">088</FONT> _left = new CastExpr(_left, arg1);<a name="line.88"></a>
<FONT color="green">089</FONT> }<a name="line.89"></a>
<FONT color="green">090</FONT> final Type arg2 = (Type) ptype.argsType().elementAt(1);<a name="line.90"></a>
<FONT color="green">091</FONT> if (!arg2.identicalTo(tright)) {<a name="line.91"></a>
<FONT color="green">092</FONT> _right = new CastExpr(_right, arg1);<a name="line.92"></a>
<FONT color="green">093</FONT> }<a name="line.93"></a>
<FONT color="green">094</FONT> return _type = ptype.resultType();<a name="line.94"></a>
<FONT color="green">095</FONT> }<a name="line.95"></a>
<FONT color="green">096</FONT> throw new TypeCheckError(this);<a name="line.96"></a>
<FONT color="green">097</FONT> }<a name="line.97"></a>
<FONT color="green">098</FONT> <a name="line.98"></a>
<FONT color="green">099</FONT> public void translate(ClassGenerator classGen, MethodGenerator methodGen) {<a name="line.99"></a>
<FONT color="green">100</FONT> final InstructionList il = methodGen.getInstructionList();<a name="line.100"></a>
<FONT color="green">101</FONT> <a name="line.101"></a>
<FONT color="green">102</FONT> _left.translate(classGen, methodGen);<a name="line.102"></a>
<FONT color="green">103</FONT> _right.translate(classGen, methodGen);<a name="line.103"></a>
<FONT color="green">104</FONT> <a name="line.104"></a>
<FONT color="green">105</FONT> switch (_op) {<a name="line.105"></a>
<FONT color="green">106</FONT> case PLUS:<a name="line.106"></a>
<FONT color="green">107</FONT> il.append(_type.ADD());<a name="line.107"></a>
<FONT color="green">108</FONT> break;<a name="line.108"></a>
<FONT color="green">109</FONT> case MINUS:<a name="line.109"></a>
<FONT color="green">110</FONT> il.append(_type.SUB());<a name="line.110"></a>
<FONT color="green">111</FONT> break;<a name="line.111"></a>
<FONT color="green">112</FONT> case TIMES:<a name="line.112"></a>
<FONT color="green">113</FONT> il.append(_type.MUL());<a name="line.113"></a>
<FONT color="green">114</FONT> break;<a name="line.114"></a>
<FONT color="green">115</FONT> case DIV:<a name="line.115"></a>
<FONT color="green">116</FONT> il.append(_type.DIV());<a name="line.116"></a>
<FONT color="green">117</FONT> break;<a name="line.117"></a>
<FONT color="green">118</FONT> case MOD:<a name="line.118"></a>
<FONT color="green">119</FONT> il.append(_type.REM());<a name="line.119"></a>
<FONT color="green">120</FONT> break;<a name="line.120"></a>
<FONT color="green">121</FONT> default:<a name="line.121"></a>
<FONT color="green">122</FONT> ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_BINARY_OP_ERR, this);<a name="line.122"></a>
<FONT color="green">123</FONT> getParser().reportError(Constants.ERROR, msg);<a name="line.123"></a>
<FONT color="green">124</FONT> }<a name="line.124"></a>
<FONT color="green">125</FONT> }<a name="line.125"></a>
<FONT color="green">126</FONT> <a name="line.126"></a>
<FONT color="green">127</FONT> public String toString() {<a name="line.127"></a>
<FONT color="green">128</FONT> return Ops[_op] + '(' + _left + ", " + _right + ')';<a name="line.128"></a>
<FONT color="green">129</FONT> }<a name="line.129"></a>
<FONT color="green">130</FONT> } <a name="line.130"></a>
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